noun
sharing an umbrella; being under one umbrella
Refers to two people sharing one umbrella, often with romantic connotations.
雨が降ってきたので、相合傘で帰った。
It started raining, so we went home sharing an umbrella.
noun
umbrella doodle with two names; love umbrella
A drawing of an umbrella with two names written underneath, symbolizing romantic love, similar to writing "X loves Y".
小学生のとき、ノートに相合傘を書いて冷やかされた。
When I was in elementary school, I was teased for drawing a love umbrella in my notebook.