mind one's ps and qs
To be very careful to behave correctly.
When we go to visit, do remember to mind your ps and qs, children – we don't want another incident like last time.
ps
noun 8name 5adj 1
Definitions
name
1
Initialism of a number of proto-languages' names:
2
Initialism of a number of proto-languages' names:
3
Initialism of a number of proto-languages' names:
4
Initialism of a number of proto-languages' names:
5
Initialism of PlayStation.
noun
1
Initialism of postal service.
USPS
2
Initialism of public school.
3
Initialism of public service(s).
4
Initialism of PlayStation.
5
Initialism of paddle steamer.
adj
1
Abbreviation of packet-switched.
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