Synonyms of 'sidelong'
She gave him a quick sidelong glance.
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Covert activities or situations are secret or hidden.
They have been supplying covert military aid to the rebels.
Indirect remarks and information suggest something or refer to it, without actually mentioning it or stating it clearly.
His remarks amounted to an indirect appeal for aid.
Thesaurus for sidelong from the Collins English Thesaurus
If you give someone a sidelong look , you look at them out of the corner of your eyes.