active participation / being active / being energetic / being lively / being thriving / being successful / flourishing / making a big contribution / playing an active role / making a great achievement / contributing greatly / being productive

to be active (in), to participate actively (in)

a boxer (participant in a boxing match) / a boxer (breed of dog)

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

boxer briefs

professional (プロフェッショナル) / production (プロダクション) / proletarian (プロレタリア, プロレタリアート) / prostitute (プロスチチュート) / proportion (プロポーション) / program (プログラム) / propaganda (プロパガンダ)

(slang) professional; like a pro

Short for 競技プログラミング (“competitive programming”).