1
- mass noun a body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing重量; 分量; 体重：
he was at least fifteen stone in weight.
他的体重至少有15英石。
1.1
- Physics the force exerted on the mass of a body by a gravitational field【物理】（引力场作用于物体上的）重力。比较MASS.
1.2
- the quality of being heavy重：
as he came upstairs the boards creaked under his weight.
他上楼梯时, 木板在他身体的重压下吱吱作响。
1.3
- count noun a unit or system of units used for expressing how much an object or quantity of matter weighs重量单位; 衡量制。
1.4
- count noun a piece of metal known to weigh a definite amount and used on scales to determine how heavy an object or quantity of a substance is秤砣; 砝码。
1.5
- the amount that a jockey is expected or required to weigh, or the amount that a horse can easily carry（骑师应有的）体重; （马能负载的）重量。
1.6
- the surface density of cloth, used as a measure of its quality（布料）表面密度。
2
- a heavy object, especially one being lifted or carried（尤指举起或运载的）重物。
2.1
- a heavy object used to give an impulse or act as a counterpoise in a mechanism（机械中用于推动或平衡的）平衡块。
2.2
- a heavy object thrown by a shot-putter投掷器械包括铁饼、铅球、链球等。
2.3
weights
blocks or discs of metal or other heavy material used in weightlifting or weight training杠铃片, 哑铃。
3
- mass noun the ability of someone or something to influence decisions or actions（对决定或行动的）影响力：
a recommendation by the committee will carry great weight.
委员会的推荐将起到重要的作用。
3.1
- the importance attached to something（某事的）重要性：
individuals differ in the weight they attach to various aspects of a job.
不同人对一个工作不同方面的重要性的认识有差异。
3.2
- Statistics a factor associated with one of a set of numerical quantities, used to represent its importance relative to the other members of the set【统计】权, 权重, 权数。
with obj.
1
- hold (something) down by placing a heavy object on top of it在…上加重量, 压住：
a mug half filled with coffee weighted down a stack of papers.
一只装有半杯咖啡的杯子压在一叠文件上。
1.1
- make (something) heavier by attaching a heavy object to it, especially so as to make it stay in place使（某物）变重（尤指为了使其不要移位）：
the jugs were covered with muslin veils weighted with coloured beads.
水壶上盖有轻薄织物, 织物上缀有使其增加重量的彩色珠子。
2
- attach importance or value to视…为重要（或有价值）, 重视：
speaking, reading, and writing should be weighted equally in the assessment.
评估时说、读和写应得到同等的重视。
2.1
be weighted
be planned or arranged so as to put a specified person, group, or factor in a position of advantage or disadvantage（使某人、某个集团或某方面处于有利或不利形势的）安排, 计划：the balance of power is weighted in favour of the government.
力量对比对政府有利。
2.2
- Statistics multiply the components of (an average) by factors to take account of their importance【统计】使加权。
3
- assign a handicap weight to (a horse)加重压于（马）上。
4
- treat (a fabric) with a mineral to make it seem thicker and heavier对（织物）作加重处理（使织物感觉更厚更重）。
短语
put on（或lose）weight
- become fatter (or thinner)体重增加, 发胖（或体重减少、变瘦）。
throw one's weight about（或around）
- informal be unpleasantly self-assertive〈非正式〉趾高气扬, 耀武扬威, 滥用权势。
throw one's weight behind
- informal use one's influence to help support〈非正式〉（利用影响力）支持。
the weight of the world
- used in reference to a very heavy burden of worry or responsibility很大的担心; 重大的责任：
he continues to carry the weight of the world on his shoulders.
他继续肩负重任。
be a weight off one's mind
- come as a great relief after one has been worried（担心之后）十分放松, 松了一大口气。
worth one's weight in gold
- (of a person) exceedingly useful or helpful（人）极其有用（或有帮助）的。
词源
Old English （ge）wiht, of Germanic origin; related to Dutch wicht and German Gewicht. The form of the word has been influenced by WEIGH1.