What is the meaning of bog down?

verb

• Get stuck while doing something.
  • usage: "She bogged down many times while she wrote her dissertation"
  • synonyms: bog
• Cause to get stuck as if in a mire.
  • usage: "The mud mired our cart"
  • synonyms: mire
• Be unable to move further.
  • usage: "The car bogged down in the sand"
  • synonyms: grind to a halt, get stuck, mire
• Cause to slow down or get stuck.
  • usage: "The vote would bog down the house"
  • synonyms: bog