superior, better / aggressive, bold, on the offensive

(sumo) an overhand hold / (sumo) the upper hand in an overhand hold / upstream, the upstream portion of a river / upwind / a skilled player of games, such as go or shogi

upstream, the upstream portion of a river / upwind / uphill, the upper portion of a hill or other geographic feature / the head of a table, the seat of honor

(rare) the left-hand side of a drawstring on a fishing net

good at

skillful, dexterous

talking about oneself (especially, when the audience is not interested)

(idiomatic) to keep a secret when asked about it, but let it slip inadvertently when chatting on another occasion

everything

(colloquial) current boyfriend