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Stick to firmly.

“Will this wallpaper adhere to the wall?”

Be a devoted follower or supporter.

“The residents of this village adhered to Catholicism”

Be loyal to.

Come or be in close contact with; stick or hold together and resist separation.

Be compatible or in accordance with.

“You must adhere to the rules”

Follow through or carry out a plan without deviation.

“They adhered to their plan”