pike·staff
noun/ˈpaɪkstɑːf/
/ˈpaɪkstæf/
Idioms Word Originlate 16th cent.: from pike ‘weapon’ + staff.
Idioms
(as) plain as a pikestaff | (as) plain as day | (as) plain as the nose on your face
- very obvious
一清二楚；一目了然；显而易见