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worry

1 worry /ˈwɚri/ verb
worries; worried; worrying
1 worry
/ˈwɚri/
verb
worries; worried; worrying
Britannica Dictionary definition of WORRY
: to think about problems or fears : to feel or show fear and concern because you think that something bad has happened or could happen
[no object]
often + about
sometimes + over
[+ object]
+ that
[+ object] : to make (someone) anxious or upset : to cause (someone) to worry

not to worry

informal
used to say that there is no cause for concern or worry

worry at

[phrasal verb]
worry at (something) chiefly British
: to pull, twist, or bite (something) repeatedly
: to try to solve (a problem) by thinking about it for a long time
2 worry /ˈwɚri/ noun
plural worries
2 worry
/ˈwɚri/
noun
plural worries
Britannica Dictionary definition of WORRY
[noncount] : a feeling of concern about something bad that might happen : the state or condition of worrying about something : anxiety
[count] : a problem or concern : something that causes you to be worried

no worries

chiefly Australia + British, informal
used to say that there is no reason to worry