down to vs up to

down to

• Next to; near; towards; as far as. 

• Ready to (do something specified). 

• With no one/nothing remaining but. 

• Due to. 

• Including even the smallest parts. 

up to

• Next to; near; towards; as far as. 

• Until. 

• Incumbent upon; the obligation of; the duty of. 

• Considering all members of an equivalence class the same. 

• Within the authority or jurisdiction of. 

• Doing; involved in. 

• For the option or decision of. 

• As much as; no more than. 

• Ready for. 

• Capable of. 

• Willing to participate in. 

• maximum of.