1. 一次性的;用完即弃的
A throwaway product is intended to be used only for a short time, and then to be thrown away.

2. (讲话、动作)不经意的，随意的
If you say that someone makes a throwaway remark or gesture, you mean that they make it in a casual way, although it may be important, or have some serious or humorous effect.

1. words spoken in a casual way with conscious under-emphasis

2. an advertisement (usually printed on a page or in a leaflet) intended for wide distribution

e.g. he mailed the circular to all subscribers

Synonym: circularhandbillbillbroadsidebroadsheetflierflyer

3. (sometimes offensive) a homeless boy who has been abandoned and roams the streets

Synonym: street arabgamin