to and fro

Short definition from Wiktionary

Adverb

1. 1
   Back and forth; with a reciprocating motion.

Verb

1. 1
   To go back and forth; to alternate.
2. 2
   Alternative spelling of to and fro.

Adjective

1. 1
   Pertaining to something or someone moving forward and back to the same position.
2. 2
   Alternative spelling of to and fro.

Noun

1. 1
   The movement (of someone or something) forward followed by a return to the same position. May refer to a concept such as an emotional state or a relationship as well as a physical thing.
2. 2
   Alternative spelling of to and fro.