Green’s Dictionary of Slang

knock into v.

1. [late 19C+] to run into.

2. [1910s+] (Aus.) to fight with.

SE in slang uses

In phrases

knock into a cocked hat (v.) (also beat into a cocked hat, blow into..., fuck into..., mash into..., knock in a cock hat, ...into fits)

[mid-19C+] (orig. US) to overturn, destroy or beat thoroughly or completely.

knock into a mish (v.) [SE mishmash]

[mid-19C] (N.Z.) to overcome, to surpass.

knock into the middle of next week (v.) (also kick into next week, knock into next century, ...the middle of next month, ...the middle of the week after next, ...into next week,...to the north end of creation, punch into the middle of..., slap..., sling...)

[early 19C+] (orig. US) to overturn, destroy or beat thoroughly or completely.