a fine line

US /ə faɪn laɪn/
UK /ə faɪn laɪn/
"a fine line" picture
1.

garis halus, perbezaan kecil

a subtle distinction or difference between two things that are very similar but can have very different consequences

:
There's a fine line between confidence and arrogance.
Ada garis halus antara keyakinan dan keangkuhan.
It's a fine line between being helpful and being intrusive.
Ada garis halus antara membantu dan mengganggu.