pia¹ /pēˈə/

A tropical monocotyledonous plant (genus Tacca; family Taccaceae) with a rhizome yielding E India or Madagascar arrowroot

• on tap
• on target
• on tenterhooks
• on terms
• on that score
• on the agenda
• on the air
• on the alert
• on the anvil
• on the back burner
• on the back foot
• on the back of
• on the back of an envelope
• on the ball
• on the barrelhead
• on the bash
• on the batter
• on the beam
• on the bench
• on the bias
• on the bit
• on the blink
• on the block
• on the boil
• on the bone