- To touch base means to get in contact.
- Base is not plural in this expression.
What does it mean to touch base? This phrase derives from a sport. Can you guess which one?
What Touch Base Means
In baseball, players must touch each of four bases in order to score a run. The prevailing hypothesis is that the phrase “touch base” is a reference to this sport. Touch base means to make contact with someone.
How to Use Touch Base In a Sentence
Touch is the verb in the phrase touch base. To use it, you must conjugate touch according to the subject of a sentence. Some people make bases plural, but this is an error. Remember, the bases do not touch each other in the game! Let’s look at two examples.
from Grammarly Blog https://www.grammarly.com/blog/touch-base/