Say an action is easy to do
It says that an action is easy to do.
JLPTN5
Verb (ます-stem) + やすい~ stem + yasui
easy to do [action]
Drop ます from a verb and add やすい to say the action is easy or pleasant to do. The result behaves like an い-adjective, so it conjugates the same way. Its opposite is にくい, which means hard to do.