(idiomatic) Something that if allowed or accepted to a small degree would lead to systematic encroachment.

(idiomatic, UK, dated) A secret pledge that one makes for another.

Alternative form of thin end of the wedge

(idiomatic) Of high standing or honor.

Something to be suspicious of.

(idiomatic) To admit to the truth of the point at issue or to a mistake; to cop a plea; or perhaps to admit to a small error but not a larger one.

(baseball, of a pitcher) Having more strikes than balls against a batter in an at-bat. / (baseball, of a batter) Having fewer strikes than balls against a pitcher in an at-bat.

(baseball, of a pitcher) Having fewer strikes than balls against a batter in an at-bat. / (baseball, of a batter) Having more strikes than balls against a pitcher in an at-bat.

One who uses violence can expect a violent response; it is better to try to use peaceful means wherever possible.

Fully; completely. / Without any reservation; taking the greatest advantage of the situation.