If you keep something back and don't share it, you withhold it. You can withhold things such as permission, emotion, or information. You might get into trouble if you withhold information from your parents or the police.
The verb withhold means to deduct from a payment and hold back. Your job will withhold money from your paycheck for things like taxes. You may also choose to withhold money from your check for healthcare, retirement, and numerous other voluntary accounts. The past tense of the verb withhold is withheld. Withhold is spelled with a double h because it is made by combining the words with and hold.