an invitation that provokes or calls out someone to engage in a contest or an argument
挑戦
to invite someone to compete or strongly suggest they should do something, often to test their abilities or encourage action
a feeling or an idea suggested by a word aside from its literal or primary meaning
含意
to implicitly convey something such as an idea, feeling, etc. in addition to something's basic meaning
意味する
used to present an alternative suggestion in case something does not happen or succeed
そうでなければ
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
to state an opinion, guess, suggestion, etc. even though there are chances of one being wrong
賭ける
to make an educational guess or to present a theory or assumption one is not sure about
仮定する