っかかったそうだ
nokkakatta sōda

Godan Verb (ru)
Evidential Auxiliary

Expresses hearsay about a past event ("I heard that...") of 乗っかかる

1. Rode on/leaned on (someone/something); Attached oneself to; Took advantage of; Joined (a group/effort)

Past/Perfective
Hearsay Evidence