(idiomatic) Something (especially a minor thing) which ruins or spoils everything else, or makes it less pleasant; a nuisance or problem; a disagreeable or unpleasant detail.

Very important; vital or crucial.

(transitive) To let someone or something come in; to admit someone or something in. / To divulge one's inner thoughts to (someone), making oneself emotionally vulnerable to them; to open up to (someone).

An archipelago and overseas territory of the United Kingdom in the middle of the Indian Ocean between Africa and Indonesia; created in 1965; currently used as a joint US/UK military base.

To experience a certain “fluttery” physical sensation in a person's stomach, associated with nervousness, uncertainty, anxiety, or apprehension.

(somewhat dated) Very tired. / (chiefly UK) With everything included. / (poker) Having no further stake to wager, but remaining active in a hand.

(poker) A hand where at least one player bets all of his or her chips. / (poker) A player who is all in.

Carbon dioxide frozen in the solid state, used especially as a cooling agent and for the production of fog-like special effects. It sublimes at −78.5 °C (−109.3 °F) at normal atmospheric pressure.

(idiomatic) A person who will rescue a dangerous situation; a hero.

Alternative spelling of knight in shining armor