Help

You can lend your aid to another creature in the completion of a task. When you take the Help action, the creature you aid gains Advantage on the next ability check it makes to perform the task you are helping with, provided that it makes the check before the start of your next turn. You can only take the Help action to help with an ability check if you and the ally you are helping are both proficient in the skill being used.
Helping an ally in this way requires at least one free hand - possibly two, at the discretion of the GM.
Alternatively, you can aid a friendly creature in attacking a creature within reach. You feint, distract the target, or in some other way team up to make your ally's attack more effective. If your ally attacks the target before your next turn, the first attack roll is made with Advantage. This use of the Help action does not require a free hand.