Wiktionary
on pins and needles
prep.phr. (context idiomatic English) Feeling sharp anticipation or anxiety; in a state of suspense.
Usage examples of "on pins and needles".
Both Mary Anne and Myriah were on pins and needles waiting for Mrs.
But I can't recreate the exact (will try) brilliance of all Japhy's answers and come-backs and come-ons with which he had me on pins and needles all the rime and did eventually stick something in my crystal head that made me change my plans in life.
I was on pins and needles the whole time he was here, this afternoon, thinking he was going to go looking around and find it up there.