control line
noun
1 Surveying a surveyed line which is used as a reference for subsequent measurements.
2A wire, cable, etc., by means of which a machine or device is controlled.
Origin
Late 19th century.
- at the door
- at the double (on the double)
- at the drop of a hat
- at the earliest
- at the end of the day
- at the end of the rainbow
- at the expense of
- at the furthest
- at the instance of
- at the latest
- at the least (or very least)
- at the mercy of
- at the minute
- at (the) most
- at the (or this) moment
- at the outside
- at the ready
- at the risk of doing something
- at the same time
- at the slope
- at the top (or bottom) of the heap
- at the trail
- at the wicket
- at this moment in time
- at this (or that) rate