crumple up

Verb

intransitive transitive broadly figuratively

(intransitive) To become crumpled or messily folded up. / (transitive) To crumple or messily fold (something).

Japanese Meaning

（自動詞）物がくしゃくしゃに凹んだり乱雑に折りたたまれる / （他動詞）物をくしゃくしゃに凹ませる、乱雑に折りたたむ

After being tossed into the back of the trunk, the old map began to crumple up.

トランクの奥に放り込んだ後、古い地図はくしゃくしゃになり始めた。

Sense（1）

(intransitive) To become crumpled or messily folded up.

Sense（2）

(transitive) To crumple or messily fold (something).

Sense（3）

(intransitive, figuratively, by extension) To collapse; to give up and fold in a stressful situation.

crumples up

（ present singular third-person ）

crumpling up

（ participle present ）

crumpled up

（ participle past ）

crumpled up

（ past ）