This paper analyses the referent of them and find it is mostly relative to "hill house" and "hill field", so it shows Hakka dialects is a hill language.

本文深入分析了它们所反映的社会内容 ，发现它们集中体现在“山居”与“山田”上 ，据此揭示了客家方言的“山话”特征。

youdao

I crossed the hill, and found myself in a field of young barley.

我翻过那座山，发现自己来到了一块大麦苗地。

《柯林斯英汉双解大词典》

We raced across a large field that skirted the slope of a hill.

我们快速穿越山坡边的一大片旷野。

《柯林斯英汉双解大词典》

They turned tail, away they went over the hill and down into the field in wild disorder,and we after them.

VOA: special.2010.03.27

They turned tail. Away they went over the hill and down into the field in wild disorder, and we after them.

VOA: special.2009.01.03

Lark Galloway Gilliam lives down the hill from the Inglewood oil field.

NPR: Oil Expansion Plans In L.A. Rile Residents

They claimed he had edged the ball to wicketkeeper Matt Prior, but Harper agreed with the not-out decision of on-field umpire Tony Hill.

BBC: ICC to investigate referral complaint made by ECB

The wicketkeeper, slips cordon and the bowler all appealed in unison, but on-field umpire Tony Hill remained unmoved, prompting England to refer the decision to Harper.

BBC: ECB's Giles Clarke says referral system is 'a shambles'