向（战斗、比赛等）发起挑战，掷下挑战书，争夺

1. to challenge to (a fight, game, etc.), to throw down the gauntlet, to contend for

Godan verb with 'mu' ending transitive verb

解决（如问题），尝试，争取（奖项、纪录等）

2. to tackle (e.g. a problem), to attempt, to go after (a prize, record, etc.)

intransitive verb Godan verb with 'mu' ending

3. to pressure (someone) for sex, to make advances to

intransitive verb Godan verb with 'mu' ending