Fro
Definition 1 of 2
Pro Tip 1/3
Archaic Usage
The adverb 'fro' is old-fashioned and rarely used in modern English. Grandfather would sometimes speak of his youth, moving 'to and fro' in the old village.
Pro Tip 2/3
Physical Motion
'Fro' describes physical movement that goes back to its starting point. The pendulum swung 'to and fro', hypnotically.
Pro Tip 3/3
Mental State
It can indicate a state of indecision or anxiety. Her thoughts raced 'to and fro', unable to settle.