All 7 Uses

white lie
in
The Curious Incident of the Dog in the Night-time
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This is called a white lie.†
Chpt 79 *

white lie = an unimportant lie (especially one told to be polite or helpful)
A white lie is not a lie at all.†
Chpt 79
This means that everything you say is a white lie because when someone says, for example, "What do you want to do today?" you say, "I want to do painting with Mrs. Peters," but you don't say, "I want to have my lunch and I want to go to the toilet and I want to go home after school and I want to play with Toby and I want to have my supper and I want to play on my computer and I want to go to bed."†
Chpt 79
And I said a white lie because I knew that Father didn't want me to be a detective.†
Chpt 79
Which was another white lie.†
Chpt 103
And this was a white lie.†
Chpt 191
And I said, "He told me the number," which was another white lie.†
Chpt 191

Definitions:

(1) (white lie)
an unimportant lie (especially one told to be polite or helpful)
(2) (meaning too rare to warrant focus)