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clap (something) on(to) (something)
To attach something to another object or a surface. You can't just clap fliers onto the wall outside my classroom—that's what the bulletin boards are for!
See also: clap
clap something on(to) something
to slap or attack something onto something else. The police came and clapped a sign onto the car saying it was abandoned. Do not clap any signs on my fence.