ぺったり

adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'

closely; tightly; sticking flat

Describes something adhering or pressing flat against a surface, often with a sense of being stuck firmly. Common in mimetic expressions.

• 壁かべにポスターをぺったり貼はった。

  I stuck the poster flat against the wall.