Apply

verb

1. To lay or place; to put (one thing to another)

   "to apply cream to a rash"

2. To put to use; to use or employ for a particular purpose, or in a particular case

   "to apply funds to the repayment of a debt"

3. To make use of, declare, or pronounce, as suitable, fitting, or relative

   "We need to apply the skills we've learned to solve this problem"

4. To put closely; to join; to engage and employ diligently, or with attention
5. To to address; to refer; generally used reflexively.