noun-modifying (irregular)
flip-up; fold-up; tip-up; top-hinged
Describes something that can be flipped, folded, or tipped upward, often hinged at the top. Used prenominally to modify nouns like 窓 (window), シート (seat), or テーブル (table).
跳ね上げ式の窓を開けて換気した。
I opened the top-hinged window to ventilate the room.
この車は跳ね上げシートを採用している。
This car features tip-up seats.
Verb form meaning 'to flip up' or 'to splash up'; 跳ね上げ is the noun/prenominal form derived from it.
Compound of 跳ね (hane, 'splash' or 'spring up') and 上げ (age, 'raise'), from the verb 跳ね上げる (haneageru).