||next in order, next to bat
||Gary's at bat; Tim's on deck.
||using drugs, do drugs
||"Do you know he's on drugs?" "Yes. His eyes look blank."
||not relaxed, nervous, anxious, edgy
||Gina's a little on edge. She gets her test results back today.
|on even terms
||having equal skills, having the same ability
||When we play chess, we're on even terms. We're both average.
||eager, energetic, all fired up, gung ho
||When he began working here, he was on fire - very enthusiastic.
|on good terms
||in a good relationship, able to talk and work with
||Steve is on good terms with all his co-workers. They like him.
|on his last legs
||very tired or old, at the end of his career
||Gordie was on his last legs, but he could still shoot hard.
|on his tail
||following him closely, chasing him
||The thief knew the police would follow him. They'd be on his tail.
|on in years
||(See get on in years)
||borrowed, signed out
||The book you want is on loan to someone else until May 12.