in service
• in or available for use.
• "the plane is the most advanced fighter in service today"
• employed as a servant.
• "poor children worked in service"
in-service
adjective
• (of training) intended for those actively engaged in the profession or activity concerned.
• "in-service training of library staff"
be of service
• be available to assist someone.
• "if you need books, we'd like to be of service"
Similar:
help,
assist,
benefit,
be helpful,
be of assistance,
be beneficial,
be advantageous,
be of benefit,
serve,
advantage,
be useful,
be of use,
be profitable,
profit,
be valuable,
be of worth,
do someone a good turn,
