(idiomatic) The identified person appears to be benign, mild-mannered, or calm (but with an integral suggestion that, to the contrary, he or she really is untrustworthy, disagreeable, or mean-spirited).

(UK) Alternative spelling of chink in the armor.

Alternative form of ass in a sling

Alternative form of ass in a sling

(Canada, US, informal, mildly vulgar) An uncomfortable personal state of affairs involving injury, defeat, or other trouble, especially a state of affairs resulting from one's own ill-considered actions.

Alternative form of put a sock in it

(idiomatic) Excluded from a group, process, or opportunity, and feeling downhearted as a result.

Alternative form of put a sock in it

Alternative form of on the outside, looking in

Dryococelus australis, a large stick insect.