English:

Major: slip, slip up, let slip

Secondary: by mistake, inadvertently, unplanned pregnancy

Māori:

Major: hinga, paheke

Metaphorical meaning is usually associated with unplanned pregnancy, or 'letting information slip'.

1. floor[825] recently[970] mop[3962] still[285] wet[4317] beware[463] slip[612]
   The floor was mopped not long ago. It's still wet, so be careful. You might slip.
2. she[2297] shock[3435] pregnant[1277] nothing[3027] plan[3086] slip-up[612]
   Her pregnancy came as a shock. It was not planned and was a slip up.
3. he[2297] slip[612] talk[2466] she[2297] know[3618] about[2543] surprise[4141] party[4546]
   He let something slip while he was talking, so she knew about the surprise party.