plough
畟 centers on the act of ploughing, specifically turning over soil with a plough.
畟 combines 田 (field) with 夂, which may represent a tool or action related to working the field, giving the idea of ploughing. The exact historical development is uncertain.
The top 田 is a field, and the bottom 夂 looks like a person walking with a tool. Imagine someone walking through a field, turning the soil with a plough.
For ショク, picture a farmer ploughing a field and stopping for a quick snack: the snack is a 'shock' bar (like a granola bar) — shock cues ショク.