急きゅうに振ふり向むいて、首くびの筋すじを違ちがえたよ。

kyuu ni furimuite, kubi no suji o chigaeta yo.

I turned around suddenly and strained a muscle in my neck. casual

重おもい荷物にもつを持もち上あげて、背中せなかの筋すじを違ちがえました。

omoi nimotsu o mochiagete, senaka no suji o chigaemashita.

I lifted a heavy load and strained a muscle in my back. neutral