American & Australian, informal

to do something very seriously and not just for enjoyment.

These arms dealers play for keeps - they want the best weapons available and will do anything to get them.

• in their infinite wisdom
• in their wisdom
• in the know
• in the lap of luxury
• in the light of
• in the light of something
• in the line of duty
• in the line of fire
• in the long haul
• in the long run
• in the long term
• in the loop
• in the main
• in the making
• in the market for
• in the market for something
• in the meantime
• in the meanwhile
• in the medium term
• in the middle of
• in the middle of doing something
• in the middle of nowhere
• in the middle of something
• in the midst of
• in the midst of doing something