垫 (diàn): подушечка

The bottom of this vase is a bit uneven; let's put a piece of paper underneath to level it.

Mom placed a wet cloth under the hot pot to keep the table from getting scorched.

When he sleeps, he puts a towel under his pillow so his neck is more comfortable.

The chair is too low; I put a few books underneath to raise it, and now the height is just right when I sit.

The workers propped up the machine with bricks to prevent the damp floor from affecting its operation.