(4)S: (v) speculate (talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion) "We were speculating whether the President had to resign after the scandal"
S: (v) speculate, job (invest at a risk) "I bought this house not because I want to live in it but to sell it later at a good price, so I am speculating"