to be ready to be used or employed instead of someone or something else.

The rumour is that Green will be sacked and Brinkworth is waiting in the wings to take over as manager.

• send someone on a guilt trip
• send someone on something
• send someone on their way
• send someone on way
• send someone out
• send someone packing
• send someone round the bend
• send someone round the twist
• send someone to Coventry
• send someone to the showers
• send something flying
• send to Coventry
• send to the showers
• send your love to
• send your love to someone
• separate out the men from the boys
• separate the men from the boys
• separate the sheep from the goats
• separate the wheat from the chaff
• serve right
• serve someone right
• serve time
• serve up
• serve up something
• serve you right