ichidan verb
can completely hide; able to conceal fully
Potential form of 隠し切る. Most often used in the negative (隠しきれない) to mean 'cannot completely hide' or 'cannot keep secret'. The affirmative is rare.
彼は動揺を隠しきれなかった。
He couldn't completely hide his agitation.
その秘密はもう隠しきれない。
That secret can no longer be kept completely hidden.
Standard kanji spelling for the potential form of 隠し切る.
Compound of 隠し (continuative form of 隠す, 'to hide') + きれる (potential form of 切る, 'to cut', here as an auxiliary verb meaning 'to do completely').