an invitation that provokes or calls out someone to engage in a contest or an argument
チャレンジ
to invite someone to compete or strongly suggest they should do something, often to test their abilities or encourage action
誰かに挑戦する
a feeling or an idea suggested by a word aside from its literal or primary meaning
含蓄
to implicitly convey something such as an idea, feeling, etc. in addition to something's basic meaning
暗示する
used to present an alternative suggestion in case something does not happen or succeed
そうでない場合
used before a comment or opinion to indicate that the speaker is sharing it, even though they may not be sure of its value or significance
私の意見が欲しいなら
to state an opinion, guess, suggestion, etc. even though there are chances of one being wrong
危険にさらす
to make an educational guess or to present a theory or assumption one is not sure about
仮説を立てる