だけ
dake
Draw a line, erase the outside: だけ
The picture You draw a line around something and treat everything outside it as gone. Draw the line tight and it means "just this"; push it out as far as it goes and it means "as much as possible".
Where the picture shows up in だけ
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a line around a thing
水だけください。
mizu dake kudasai
Just water, nothing else, please.
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a line around an action
見ているだけです。
mite iru dake desu
I'm not buying — just looking.
This is the set phrase you use when a shop assistant approaches you.
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a line around a span of time
五分だけ待ってください。
go-fun dake matte kudasai
Five minutes and no more — please wait that long.
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the line pushed out
できるだけ早く連絡します。
dekiru dake hayaku renraku shimasu
I'll get in touch as soon as I possibly can.
Memorise できるだけ whole: here the line is pushed to its widest, not drawn tight.