くらい
kurai
A loose circle instead of a dot: くらい／ぐらい
The picture Instead of marking an exact dot, you draw a loose circle around roughly where it lands. That looseness is why it works for time, for brushing something off, and for naming a bare minimum. ほど takes a reading off a notch and sounds firm; くらい loops loosely around the area and sounds casual, sometimes even dismissive.
Where the picture shows up in くらい
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circling a time
三十分ぐらいで着きます。
san-juppun gurai de tsukimasu
I'll be there in about thirty minutes.
Instead of a dot on the thirty-minute mark, a big loose loop drawn around that part of the dial.
Same slot as ほど, but くらい is the conversational one. ぐらい is the same word with a voiced g, and it's the commoner one in speech.
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circling a size, loosely
これぐらいなら私にもできます。
kore gurai nara watashi ni mo dekimasu
Something this small I can manage myself.
A hand held out flat, drawing a small circle above the palm: “a thing about this big”.
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circling the bare minimum
挨拶ぐらいしてください。
aisatsu gurai shite kudasai
Forget the rest — you could at least say hello.
A minimum line chalked on the floor with GREETING written on it, and a hand waving you to at least step over it.
It scolds, so don't aim this at a superior.
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circling how far it went
声が出ないくらい叫びました。
koe ga denai kurai sakebimashita
I shouted until I'd about lost my voice.
A circle drawn around the point where the voice gave out, marking “I shouted as far as here”.
All of it in one picture
All that changes is what the circle goes around. Loop the thirty-minute part of the dial and you get “about half an hour”; loop a small size above your palm and you get “something this trivial”; loop the minimum line on the floor and you get “at least say hello”. The last one circles the point where the voice ran out, to say “that far”. Because the circle is always loose, くらい carries a shrug with it — nothing is being pinned down.