1. To descend from the air and set down on top of someone or something. The wasp landed on my arm, so I had to stand perfectly still until it flew off again. His ball landed on Mrs. Thomson's rose bush, ruining dozens of the flowers.
2. To become the burden or responsibility of someone, especially very suddenly, unceremoniously, or without prior notice. It always lands on me to deal with the boss's stupid mistakes. Blame for their loss has to land on the team's coaching staff.
land (up)on someone or something
to light on someone or something. (Upon is formal and less commonly used than on.) A bee landed upon her and frightened her. The spoon I dropped landed on the cake and ruined the icing.