•Start from scratch (idiom) -

To start from the very beginning; to start from nothing. （白手起家，从零开始）

Examples:

1.Nothing like this had ever been done before, so we had to start from scratch.

2.I built every bit of my own house. I started from scratch and did everything with my own hands.

•Devote oneself to sth/sb (phrasal verb) -

To give your time or effort completely to something you believe in or to a person.（致力于……，献身于……）

Examples:

1.She devoted herself to raising her children.

2.Over half his speech was devoted to the issue of saving Social Security.

•All by/on one's lonesome (idiom) -

All alone; by oneself.（独自地，寂寞地）

Examples:

1.Don't leave your puppies all on their lonesome.

2.Mary's folks went out and left her all by her lonesome.

•Dispense with sb/sth (phrasal verb) -

To no longer use someone or something because you no longer want or need them.（免除，舍弃）

Examples:

1.I think we all know each other, so we can dispense with the formalities.

2.We will have to dispense with the expensive gifts this year.

•Solicitude (noun) -

Care or concern for someone or something.

（关心，关怀）

Examples:

1.I was touched by his solicitude.

2.He would look after his friends with rather touching solicitude.