lockstep

Short definition from Wiktionary

Noun

1. 1
   A step whereby the toe of one man is brought very close to the heel of the man in front.
2. 2
   Close connection, unison, rigid synchronization.
3. 3
   An inflexible, rigid or stifling pattern.

Adjective

1. 1
   In close connection, in unison, synchronized.