yán​sī​hé​fèng

to fit perfectly

严丝合缝 嚴絲合縫 yán​sī​hé​fèng
to fit perfectly
to fit together snugly with no gaps; to dovetail perfectly
airtight
(of a speech or plan) flaw-free and leaving no room for exploitation; watertight

Frequency

Movie subtitles
0.270 per million appears in 0% of films
Written text
0.201 per million

Sources