mass noun
1
- the quality of being hot; high temperature热, 高温：
it is sensitive to both heat and cold.
它对热冷都很敏感。
1.1
- Physics heat seen as a form of energy arising from the random motion of the molecules of bodies, which may be transferred by conduction, convection, or radiation【物理】热, 热能。
1.2
- hot weather conditions炎热天气：
the oppressive heat was making both men sweat.
酷热让两个男人都冒了汗。
1.3
- a source or level of heat for cooking（做饭的）热源; 热度：
remove from the heat and beat in the butter.
从火上挪开并加入黄油搅拌。
1.4
- a spicy quality in food that produces a burning sensation in the mouth辣味：
chilli peppers add taste and heat to food.
红辣椒可以给食物增添滋味和辣味。
1.5
- technical the amount of heat that is needed to cause a specific process or is evolved in such a process〈技〉热量：
the heat of formation.
生成热。
1.6
- count noun technical a single operation of heating something, especially metal in a furnace〈技〉（尤指在熔炉中熔炼金属时的）单次熔炼, 一次熔炼。
2
- intensity of feeling, especially of anger or excitement愤怒; 激动; 强烈的情绪：
conciliation services are designed to take the heat out of disputes.
调解机构的目的是缓解纠纷各当事方的激动情绪。
2.1
the heat
informal intensive and unwelcome pressure or criticism, especially from the authorities〈非正式〉（尤指源于权威方的）紧张感（或压力、责难）：a flurry of legal proceedings turned up the heat in the dispute
接二连三的诉讼行动加剧了纠纷的紧张气氛
the heat is on
施压开始了。
3
- count noun a preliminary round in a race or contest预赛：
winners of the regional heats.
地区预赛的优胜者。
1
- make or become hot or warm（使）变热, （使）变暖：
with obj. the room faces north and is difficult to heat房间朝北, 加温较难
no obj. the pipes expand as they heat up.管子受热膨胀。
1.1
- no obj.
heat up
(of a person) become excited or impassioned（人）激动起来; 充满激情。
1.2
- no obj.
heat up
become more intense and exciting加剧, 激烈起来, 激化： the action really begins to heat up.
剧情真正开始紧张了。
1.3
- with obj. archaic inflame; excite〈古〉激起; 使激动：
this discourse had heated them.
这次谈话使他们很激动。
短语
if you can't stand the heat, get out of the kitchen
- proverb if you can't deal with the pressures and difficulties of a situation or task, you should leave others to deal with it rather than complaining〈谚〉怕热, 就别呆在厨房里（意指倘若无法应对压力和困难就应让别人去处理, 而不是抱怨）。
in the heat of the moment
- while temporarily angry, excited, or engrossed, and without stopping for thought一时冲动之下; 盛怒之下; 一时性起。
on（或〈美〉in）heat
- (of a female mammal) in the receptive period of the sexual cycle; in oestrus（雌性哺乳动物）在发情期中; 发情。
词源
Old English hǣtu (noun), hǣtan (verb), of Germanic origin; related to Dutch hitte (noun) and German heizen (verb), also to HOT.