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They signed a contract to buy the house.

A legally binding agreement between two or more parties that outlines the terms and conditions of a specific transaction or relationship.
The contract was very long.
We need a new contract.
Read the contract carefully.
sign a contract
breach of contract
enter into a contract
agreement
deal
pact
They decided to contract for the construction of the new building.

to enter into a formal agreement or arrangement.
We will contract for the services.
They contract to build the bridge.
She will contract for the catering.
contract for services
contract to build
contract for catering
agree
arrange
undertake